Finding the Fourth Proportional to 1,413.76, 1,949.72 and 915.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,413.76 : 1,949.72 = 915.90 : x
2. Step 2: Convert to fraction form
   1,413.76/1,949.72 = 915.90/x
3. Step 3: Cross multiply
   1,413.76x = 1,949.72 × 915.90
4. Step 4: Simplify right side
   1,413.76x = 1,785,748.55
5. Step 5: Solve for x
   x = 1,785,748.55/1,413.76
6. Step 6: Final answer
   x = 1,263.12